FEARS are growing for the safety of a man who went missing from his flat a fortnight ago.

Christopher Knights has not been seen since October 8, according to police officers who said his family are becoming increasingly anxious about his whereabouts. The 26-year-old has a history of going missing – having sparked a previous search two years ago.

Last night one of Mr Knights’ flatmates appealed for him to get in touch.

Stephen Martin, 26, a self-employed teacher, had only been living with Christopher for a number of days before he failed to return home.

Mr Martin said: “He seemed like a really nice, laid-back guy. There wasn’t anything wrong or bothering him as far as I could tell.”

Mr Martin said he believes Christopher works with his dad “restoring properties”.

He heard him leave for work one morning – but believes he did not return to the flat after that.

He added: “By Friday night I was really starting to get concerned, but my friends told me not to worry, saying he’s a grown man, and was probably off somewhere with friends and that most people would be thrilled not to have their flatmate around all the time.”

Christopher, who is described as white, 5ft 10in tall, slim, with blue eyes, and short brown hair, was yesterday the focus of a widespread police appeal for information.

Mr Martin added: “I barely slept all weekend. Every time I heard a noise I wondered if it was him coming back.

“I tried phoning him but it just said the call could not be connected. Part of me thought I was maybe being overly ­dramatic.

“As far as I know he doesn’t have a girlfriend and I have never met any of his family or friends.”

The flatmate found a letter from an opticians suggesting Christopher was due to attend an appointment in the period he has been missing.

When Christopher called up, the staff at the opticians told him he should contact the police.

It has since emerged Christopher previously went missing on June 27, 2011, after being dropped off in West Mains Road at King’s Buildings in Blackford by his father. He was traced safe and well in Glasgow two weeks later.

Mr Martin said: “The police have searched his room several times, and a specialist team is coming back tonight. I’d just like to know that he’s OK. As far as I can see he hasn’t taken anything with him and it’s obviously very worrying.”

Police Scotland have appealed for anyone with information to come forward.

A Police Scotland spokesman said: “While there are no immediate concerns for Christopher’s safety, his family are anxious to hear that he is safe and well. We would encourage Christopher to contact his family or the police to let us know that he is OK. Similarly, anyone who has seen or heard from him should also get in touch.”

When last seen he was wearing a black sweatshirt, a navy shower-proof golf top and navy golf trousers and carrying a small black rucksack.